hoggy writes: According to the BBC:'The famous sea lions of San Francisco's Fisherman's Wharf have disappeared after 20 years — leaving experts baffled as to why.Last month, Pier 39 groaned under the weight of some 1,500 of the animals. But now all but a few have swum off bringing to an end a two-decade long sojourn — and one of the world's smelliest tourist attractions.... Officials hope the departure is only temporary — as a 20th anniversary party had been planned for 15 January.... One more outlandish theory is that their departure is the sign of an imminent earthquake.'My theory is that they just hate parties.